I love when The Queen uses the Festival of Remembrance as a chance to wear a rare jewel, because it feels like an extra special tribute. She delivered this year with Queen Alexandra's Wedding Brooch, which reappeared in 2014 after not being seen for over forty years. She also wore the Bahrain Pearl Drop Earrings for the first time in a long time; they were last seen loaned to The Countess of Wessex. Adding to her pearl look were a double strand of large pearls, and her Pearl Evening Watch (which looks like it has shorter fringes around the face this time, but that could just be the angle). Her Majesty also wore a few additional diamond rings, as she often does in the evening.

This was the first appearance at the Festival of Remembrance for The
Duke and Duchess of Cambridge, a welcome addition to the royal party
with The Prince of Wales and Duchess of Cornwall currently in New
Zealand.

Your requisite fashion notes: The Duchess of Cambridge wore black Dolce & Gabbana lace with a crystal poppy pin. The Countess of Wessex wore Roksanda Ilincic with a poppy clutch from Lulu Guinness and the badge of Queen Alexandra's Royal Army Nursing Corps, of which she is Colonel-in-Chief, and her own crystal poppy pin. The Buckley London poppy brooches worn by both royal ladies help support the Royal British Legion, so I'm always happy to see them given a little extra royal publicity.

BBC screencap

In addition to The Queen, The Duke of Edinburgh, The Duke and Duchess of Cambridge, and The Earl and Countess of Wessex, a long roster of family members were present: The Duke of York, The Princess Royal and Vice Admiral Sir Tim
Laurence, The Duke and Duchess of Gloucester, The Duke of Kent, Prince
and Princess Michael of Kent, and Princess Alexandra of Kent.